Journal
ENVIRONMENTAL MICROBIOLOGY
Volume 22, Issue 6, Pages 2053-2079Publisher
WILEY
DOI: 10.1111/1462-2920.14952
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Funding
- Natural Science Foundation of Guangdong Province in China [2018A030313141] Funding Source: Medline
- The National Natural Science Foundation of China [31800092] Funding Source: Medline
- The High-level Talent Start Funding Project of South China Agricultural University [219218] Funding Source: Medline
- Key Projects of Guangzhou Science and Technology Plan [201904020022] Funding Source: Medline
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Phosphorus is a macronutrient that is essential for plant survival. Most land plants have evolved the ability to form a mutualistic symbiosis with arbuscular mycorrhizal (AM) fungi, which enhances phosphate (Pi) acquisition. Modulation of Pi transporter systems is the master strategy used by mycorrhizal plants to adapt to ambient Pi concentrations. However, the specific functions of PHOSPHATE TRANSPORTER 1 (PHT1) genes, which are Pi transporters that are responsive to high Pi availability, are largely unknown. Here, we report that AsPT5, an Astragalus sinicus (Chinese milk vetch) member of the PHT1 gene family, is conserved across dicotyledons and is constitutively expressed in a broad range of tissues independently of Pi supply, but is remarkably induced by indole-3-acetic acid (auxin) treatment under moderately high Pi conditions. Subcellular localization experiments indicated that AsPT5 localizes to the plasma membrane of plant cells. Using reverse genetics, we showed that AsPT5 not only mediates Pi transport and remodels root system architecture but is also essential for arbuscule formation in A. sinicus under moderately high Pi concentrations. Overall, our study provides insight into the function of AsPT5 in Pi transport, AM development and the cross-talk between Pi nutrition and auxin signalling in mycorrhizal plants.
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